<template>
    <div class='list' ref="wrapper">
        <div>
        <div class="area">
            <div class="title border-topbottom">
                当前城市
            </div>
            <div class="button-list">
                <div class="button-wrapper">
                    <div class="button"> {{this.currentCity}}</div>
                </div>
            </div>
        </div>
         <div class="area">
             <div class="title border-topbottom">
                 热门城市
             </div>
             <div class="button-list">
                <div class="button-wrapper" v-for='item of hot' :key="item.id"
                @click ='handleCityClick(item.name)'
                >
                    <div class="button">{{item.name}}</div>
                </div>
            </div>
        </div>
         <div class="area" v-for = '(item,key) of cities ' :key="key" :ref='key'>
             <div class="title border-topbottom">
                 {{key}}
             </div>
             <div class="item-list">
                 <div class="item border-bottom" v-for ='innerItem of item' :key='innerItem.id'
                 @click="handleCityClick(innerItem.name)"
                 >
                     {{innerItem.name}}
                 </div>
             </div>
        </div>
        </div>
    </div>
</template>
<script>
import Bscroll from 'better-scroll'
import {mapState,mapMutations} from 'vuex'
export default {
    name:'CityList',
    props:{
        hot:Array,
        cities:Object,
        letter:String
    },
    computed: {
        ...mapState({
            currentCity:'city'
        })
    },
    methods: {
        handleCityClick(city){
            // this.$store.commit('changeCity',city)
            this.changeCity(city)
            this.$router.push('/')
        },
        ...mapMutations(['changeCity'])
    },
    mounted () {
        this.scroll = new Bscroll(this.$refs.wrapper)
    },
    watch: {//监听从父组件传递过来的值
        letter (){
            if(this.letter){
                // 利用scroll的一个属性
                const element = this.$refs[this.letter][0]
                this.scroll.scrollToElement(element)
            }
        }
    }
}
</script>

<style lang = 'stylus' scoped>
@import '~style/varibles.styl'
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color: #ccc
  .border-bottom
    &:before
      border-color: #ccc
  .list
    overflow: hidden
    position: absolute
    top: 1.68rem
    left: 0
    right: 0
    bottom: 0
    .title
      line-height: .54rem
      background: #eee
      padding-left: .2rem
      color: #666
      font-size: .26rem
    .button-list
      overflow: hidden
      padding: .1rem .6rem .1rem .1rem
      .button-wrapper
        float: left
        width: 33.33%
        .button
          margin: .1rem
          padding: .1rem 0
          text-align: center
          border: .02rem solid #ccc
          border-radius: .06rem
    .item-list
      .item
        line-height: .76rem
        padding-left: .2rem
</style>